o Alfresco key store manages keys and backup keys internally
o moved key registration and checking into AlfrescoKeyStoreImpl
o encryptor thread cache fix resulting from reload of key stores at runtime
o more encryption and key store tests
o tidy up + more comments
o moved hard-coded values to properties file
git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@30405 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261